Alumina-basic type, agglomerated submerged arc welding flux, which is designed for but and fillet welding and for the single-and multi-pass butt welding of mild, medium and high tensile steels in shipbuilding, pipe, pressure vessel and steel construction. Sutiable to use in bridge, stadium, heavy steel construction and equipments. Provides high tensile strength in fine grained structural steels. Has a high current capacity and good characteristics both on alternative and direct current.